Old St. Peter's Church (begun about A.D. 330) was probably the first significant early Christian basilica, a style of church architecture that came to dominate the early Middle Ages. Old St. Peter's stood on the site of the present St. Peter's Basilica in Rome. The first significant buildings in the medieval Romanesque style were churches built in Italy during the 800's. Several outstanding examples of the Byzantine architectural style of the Middle East were also built in Italy. The most famous Byzantine structure is the Basilica of St. Mark in Venice.